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Retrieving cloud, dust and ozone abundances in the Martian atmosphere using SPICAM/UV nadir spectra
Vandaele, A. C.; Montmessin, F.; Willame, Y. +4 more
We present the retrieval algorithm developed to analyse nadir spectra from SPICAM/UV aboard Mars-Express. The purpose is to retrieve simultaneously several parameters of the Martian atmosphere and surface: the dust optical depth, the ozone total column, the cloud opacity and the surface albedo. The retrieval code couples the use of an existing com…
Evolutionary Phases of Gas-rich Galaxies in a Galaxy Cluster at z = 1.46
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +7 more
We report a survey of molecular gas in galaxies in the XMMXCS J2215.9-1738 cluster at z = 1.46. We have detected emission lines from 17 galaxies within a radius of R 200 from the cluster center, in Band 3 data of the Atacama Large Millimeter/submillimeter Array, with a coverage of 93-95 GHz in frequency and 2.33 arcmin2 in sp…
The pebbles/boulders size distributions on Sais: Rosetta's final landing site on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +53 more
By using the imagery acquired by the Optical, Spectroscopic, and Infrared Remote Imaging System Wide-Angle Camera (OSIRIS WAC), we prepare a high-resolution morphological map of the Rosetta Sais final landing site, characterized by an outcropping consolidated terrain unit, a coarse boulder deposit and a fine particle deposit. Thanks to the 0.014 m…
Statistical Detection of the He II Transverse Proximity Effect: Evidence for Sustained Quasar Activity for >25 Million Years
Hennawi, Joseph F.; Prochaska, J. Xavier; Crighton, Neil H. M. +2 more
The He II transverse proximity effect—enhanced He II {Ly}α transmission in a background sightline caused by the ionizing radiation of a foreground quasar—offers a unique opportunity to probe the morphology of quasar-driven He II reionization. We conduct a comprehensive spectroscopic survey to find z∼ 3 quasars in the foreground of 22 background qu…
Spatial variations of brightness, colour and polarization of dust in comet 67P/Churyumov-Gerasimenko
Afanasiev, Viktor L.; Rosenbush, Vera K.; Ivanova, Oleksandra V. +2 more
We present post-perihelion photometric and polarimetric observations of comet 67P/Churyumov-Gerasimenko performed at the 6-m telescope of the SAO RAS in the g-sdss (465/65 nm), r-sdss (620/60 nm) and R filters. Observations in November and December 2015 and April 2016 covered the range of heliocentric distance 1.62-2.72 au and phase angle 33.2°-10…
Quiescent Prominence Dynamics Observed with the Hinode Solar Optical Telescope. II. Prominence Bubble Boundary Layer Characteristics and the Onset of a Coupled Kelvin-Helmholtz Rayleigh-Taylor Instability
Liu, Wei; Hillier, Andrew; Berger, Thomas
We analyze solar quiescent prominence bubble characteristics and instability dynamics using Hinode/Solar Optical Telescope data. We measure the bubble expansion rate, prominence downflows, and the profile of the boundary layer brightness and thickness as a function of time. The largest bubble analyzed rises into the prominence with a speed of abou…
Not that long time ago in the nearest galaxy: 3D slice of molecular gas revealed by a 110 yr old flare of Sgr A*
Sunyaev, R.; Churazov, E.; Ponti, G. +1 more
A powerful outburst of X-ray radiation from the supermassive black hole Sgr A* at the centre of the Milky Way is believed to be responsible for the illumination of molecular clouds in the central ∼100 pc of the Galaxy (Sunyaev, Markevitch & Pavlinsky; Koyama et al.). The reflected/reprocessed radiation comes to us with a delay corresponding to…
Multitracer CMB delensing maps from Planck and WISE data
Sherwin, Blake D.; Hill, J. Colin; Yu, Byeonghee
Delensing, the removal of the limiting lensing B -mode background, is crucial for the success of future cosmic microwave background (CMB) surveys in constraining inflationary gravitational waves (IGWs). In recent work, delensing with large-scale structure tracers has emerged as a promising method both for improving constraints on IGWs and for test…
NOMAD spectrometer on the ExoMars trace gas orbiter mission: part 2—design, manufacturing, and testing of the ultraviolet and visible channel
Vandaele, Ann Carine; Neefs, Eddy; Ristic, Bojan +48 more
Dwarf nova outbursts in intermediate polars
Hameury, J. -M.; Lasota, J. -P.
Context. The disc instability model (DIM) has been very successful in explaining the dwarf nova outbursts observed in cataclysmic variables. When, as in intermediate polars, the accreting white dwarf is magnetised, the disc is truncated at the magnetospheric radius, but for mass-transfer rates corresponding to the thermal-viscous instability such …